[time-nuts] Are there SC-crystals out there in the wild that are not Overtone?

[Bob kb8tq]

Hi

> On Feb 28, 2020, at 9:33 AM, jimlux <jimlux at earthlink.net> wrote:
> 
> On 2/28/20 2:34 AM, Attila Kinali wrote:
>> On Thu, 27 Feb 2020 08:45:16 -0800
>> "Richard (Rick) Karlquist" <richard at karlquist.com> wrote:
>>> OTOH, you could build a simple Colpitts
>>> oscillator and see where it oscillates.
>>> That's what they did back in the dark
>>> ages.
>>> 
>>> Any time nut should be up for that.
>> Yes, but how many of us can build a time-nuts quality oscillator?
>> I'm still lacking that paper/book that teaches me how to build
>> a high stability oscillator.
> 
> 
> I think to a large extent that is more art than science. High performance electronics (low noise, high stability, mass production, you name it) is always a combination of tradeoffs of non-ideal behavior, much of which is not necessarily modelable in a systems sense. So the trades get made by "gut feel" developed from experience.

There are papers that dive into some of the tradeoffs. Things like 
phase noise get a lot of attention. However, every attempt that I’m
aware of to write an “oscillator cookbook” has either become very
narrow ( = how to use this chip in a clock oscillator) or has hit a wall
before becoming useful. 

The normal way high precision oscillators are “learned" is to either 
learn it from the guy on the next bench (who already knows) or to
do a whole lot of experimentation. Even there, the process is pretty
narrowly focused. 

Bob

> 
> Driving along that path a bit further, the really fundamental improvements come when someone figures out how to get better performance without needing art and skill.  Movable type brought the written word to everyone. Offset printing brought high quality image reproduction to the masses. Silicon lithography brought computation to all of us.
> 
> 
>> I have a couple of 5MHz 3rd OT SC cut crystals in HC-37 case sitting
>> in a box, waiting to be used as some oscillator, I just lack the knowledge
>> to make good use of them.
> 
> Experiment. Build a fet or MMIC oscillator and see how it works.
> 
>> 				Attila Kinali
> 
> 
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